Strange PC Problem?

Hi i have just bought a brand new pc but i am having a very wierd problem with which i belive could be anything.!

It is very noticable when typing, basicly when im typing(or playing games) my pc seems to freeze/pause? for about a second and doesnt respond. If i am typing and it pauses? when a key is pressed it repeats the key press (i.e. typing 'lol' might come out as 'looooooooooooooooooool', when i only pressed the 'o' button once). Or if it pauses? when im typing but not on a key press it will miss the key press comepletely (i.e if i type 'lol' it may come out as 'l' and miss out the last 'ol'). I have never come across this problem ever in my life and i am totaly confused at what it may be?

I would very much appreciate it if you could reply, even if its just saying you have experienced the same problem.

My system specs can be found Here
I have also 1GB Corsair Twinx 3200 400Hz (Two 512MB's)